432 
SYNGENESIA FRUSTRANEA. 
Root annual. Stem erect, three to four feet high, branching, sprinkled 
with a few hairs. Leaves lanceolate, very acute, serrate, somewhat ribbed*, 
sprinkled like the stem with a fewshor t hairs, the lower p # iqnate, the upper 
ternate and simple. Peduncles one-flowered, long, opposite and terminal. 
Exterior involucrum eight-leaved, the leaves linear-lanceolate, ciliate, une- 
qual, much longer than the disk; the interior eight-leaved, leaves membra- 
naceous, scarcely as long as the disk. Florets of the ray 0; of the disk 
tubular, yellowish. Seeds compressed, rugose; awns two, retrorsely acu- 
leate. Receptacle flat, chaffy; chaff linear-lanceolate, falling with the seeds.. 
Grows in damp soils. 
Flowers June — September- 
5. BlPlNWATA, 
Flowers irregularly 
radiate, exterior invo- 
lucrum longer than the 
disk; leaves bipinnate, 
leaflets lanceolate, pin- 
natifid. 
Sp.pl. 3. p. 1721. Mich. 2. p. 135. Pursh, 2. p. 567- Nutt. 2. p. 
179. 
Root annual. Stem two to four feet high, glabrous, obtusely four-angled, 
branching, the branches opposite. Leaves decussate, glabrous, often doubly 
pinnatifid, the segments somewhat lanceolate, a little hairy along the mar- 
gins. Peduncles long, generally terminal. Exterior involucrum eight- 
leaved, leaves linear-lanceolate, acute, nearly glabrous, unequal, longer than 
the disk, at first erect, afterwards expanding; interior eight-leaved, scarcely 
as long as the disk, fringed near the summit. Florets of the ray generally 
three, obovate, yellow, scarcely as long as the disk; of the disk about twen- 
ty, yellow, tubular. Seed oblong, slightly angled, nearly twice as long as 
the interior involucrum, crowned by three, sometimes four unequal, short 
awns. There is a striking difference in habit between this species and the 
B. Chrysanthemoides; there is also much difference in the seed, but as far 
as the seed is concerned, B. Frondosa and B. Piiosa, appear to connect 
intimately the two extremes. 
Grows in dry soils — common. 
Flowers July — October. 
J3. nonbus subradia- 
tis; involucro exteriore 
disco longiore; foliis 
bipinnatis, foliolis lan- 
ceolatis, pinnatifidis. 
